drivers/gpu/drm/virtio/virtgpu_object.c

   1 /*
   2  * Copyright (C) 2015 Red Hat, Inc.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining
   6  * a copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial
  15  * portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 #include "virtgpu_drv.h"
  27
  28 static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
  29 {
  30         struct virtio_gpu_object *bo;
  31         struct virtio_gpu_device *vgdev;
  32
  33         bo = container_of(tbo, struct virtio_gpu_object, tbo);
  34         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
  35
  36         if (bo->hw_res_handle)
  37                 virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
  38         if (bo->pages)
  39                 virtio_gpu_object_free_sg_table(bo);
  40         drm_gem_object_release(&bo->gem_base);
  41         kfree(bo);
  42 }
  43
  44 static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo,
  45                                           bool pinned)
  46 {
  47         u32 c = 1;
  48         u32 pflag = pinned ? TTM_PL_FLAG_NO_EVICT : 0;
  49
  50         vgbo->placement.placement = &vgbo->placement_code;
  51         vgbo->placement.busy_placement = &vgbo->placement_code;
  52         vgbo->placement_code.fpfn = 0;
  53         vgbo->placement_code.lpfn = 0;
  54         vgbo->placement_code.flags =
  55                 TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT | pflag;
  56         vgbo->placement.num_placement = c;
  57         vgbo->placement.num_busy_placement = c;
  58
  59 }
  60
  61 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
  62                              unsigned long size, bool kernel, bool pinned,
  63                              struct virtio_gpu_object **bo_ptr)
  64 {
  65         struct virtio_gpu_object *bo;
  66         enum ttm_bo_type type;
  67         size_t acc_size;
  68         int ret;
  69
  70         if (kernel)
  71                 type = ttm_bo_type_kernel;
  72         else
  73                 type = ttm_bo_type_device;
  74         *bo_ptr = NULL;
  75
  76         acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, size,
  77                                        sizeof(struct virtio_gpu_object));
  78
  79         bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
  80         if (bo == NULL)
  81                 return -ENOMEM;
  82         size = roundup(size, PAGE_SIZE);
  83         ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, size);
  84         if (ret != 0)
  85                 return ret;
  86         bo->dumb = false;
  87         virtio_gpu_init_ttm_placement(bo, pinned);
  88
  89         ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, size, type,
  90                           &bo->placement, 0, !kernel, NULL, acc_size,
  91                           NULL, NULL, &virtio_gpu_ttm_bo_destroy);
  92         /* ttm_bo_init failure will call the destroy */
  93         if (ret != 0)
  94                 return ret;
  95
  96         *bo_ptr = bo;
  97         return 0;
  98 }
  99
 100 int virtio_gpu_object_kmap(struct virtio_gpu_object *bo, void **ptr)
 101 {
 102         bool is_iomem;
 103         int r;
 104
 105         if (bo->vmap) {
 106                 if (ptr)
 107                         *ptr = bo->vmap;
 108                 return 0;
 109         }
 110         r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
 111         if (r)
 112                 return r;
 113         bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
 114         if (ptr)
 115                 *ptr = bo->vmap;
 116         return 0;
 117 }
 118
 119 int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
 120                                    struct virtio_gpu_object *bo)
 121 {
 122         int ret;
 123         struct page **pages = bo->tbo.ttm->pages;
 124         int nr_pages = bo->tbo.num_pages;
 125
 126         /* wtf swapping */
 127         if (bo->pages)
 128                 return 0;
 129
 130         if (bo->tbo.ttm->state == tt_unpopulated)
 131                 bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm);
 132         bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
 133         if (!bo->pages)
 134                 goto out;
 135
 136         ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
 137                                         nr_pages << PAGE_SHIFT, GFP_KERNEL);
 138         if (ret)
 139                 goto out;
 140         return 0;
 141 out:
 142         kfree(bo->pages);
 143         bo->pages = NULL;
 144         return -ENOMEM;
 145 }
 146
 147 void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
 148 {
 149         sg_free_table(bo->pages);
 150         kfree(bo->pages);
 151         bo->pages = NULL;
 152 }
 153
 154 int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
 155 {
 156         int r;
 157
 158         r = ttm_bo_reserve(&bo->tbo, true, no_wait, false, NULL);
 159         if (unlikely(r != 0))
 160                 return r;
 161         r = ttm_bo_wait(&bo->tbo, true, true, no_wait);
 162         ttm_bo_unreserve(&bo->tbo);
 163         return r;
 164 }
 165